Let-off for narrow-ware looms



E. R'. HOLMES LET-OFF FOR NARROW WARE LOOMS Filed Dec.-26, 1924 ERLMW l atented July 20, 1326.

UNITED STATES 1,593,214 PATENT OFFIE.

ELBRIDGE R. HOLMES, OF VIORCESTEB, IVIASSACHUSETTS, ASSIGNOR TO CBOMPTON 86 KNOWLES LOOIHIL' \VORKS, 0F WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

LET-OFF FOR NARROW-WARE LOOMS.

Application filed December 26, 1924. Serial No. 758,004.

This invention relates to improvements in let-offs adapted more particularly for use on narrow ware looms and it is the general object of my invention to provide an improved tension bar for mechanisms of this type which will permit the same to be used with beams of varying widths.

It is a further object of my invention to provide a tension bar for let-oil. mechanism employing friction hangers readily adjustable to beams of different widths but held against rotation on said bar by means of resilient coils which extend around the bar in opposite direct-ions.

A still further object of my invention is to provide adjustable tension bar hangers which cooperate with the usual weighted lever to prevent side motion of the bar.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings, wherein I have shown one form of my invention Fig. 1 is a side elevation of the rear portion of a loom having my invention applied thereto, certain parts being shown in section,

Fig. 2 is a rear elevation of the structure I shown in Fig. 1, looking in the direction of arrow 2, Fig. 1,

Fig. 3 is a section on line 33 of Fig. -1

on an enlarged scale, and

Fig. 4: is an end elevation of the bar and hanger shown in Fig. 3.

Referring more particularly to the drawings it will be seen that I have provided a loom frame ,10 having upper and lower cross girtsll and 12, respectively, to which are secured a plurality of brackets 13. Said brackets are mounted for longitudinal adjustment with respect to the girts in any approved manner and support a plurality of bars 14. The brackets are each provided with an open bearing 15 each pair of brackets supporting a beam B having a pin 16 received by the bearings 15. Pivotally mounted on each bracket as at 17 is a weighted lever 18 having rearwardly ex tending arms 19 to which are attached weights 20 and having an integral connecting link 21.

The beam B is provided with grooved flanges 22each of which receives a flexible tate.

rope or strap 23 one end of which is anchoredas at 2& to a hook 25 secured in the lower part of the bracket 18 and the other end of which terminates in a hook 26.

My invention relates more particularly to the device for connecting the hooks 26 to the weighted lever 18.

In carrying out my invention I provide a tension bar 31 preferably though not neces sarily formed of steel. Each end of the ten sion bar has frictionally attachedthereto a hanger 32 which is formed as shownin Fig. l with an eye 33 and coil 34. The coils normally have an internal diameter less than the diameter of the bar 31 and are expanded slightly to fit over the ends of the tensio bar to be held frictionally thereto.

In operation the weights 20 place a tension on the warp threads through link 21 and the ropes or straps 23 are held tightly 1n grooves 22 until the tension ofthe warps becomes great enough to lift the lever 18 against the tension bar, at which time the latter is raised and the friction of the straps is released to permit the yarn beam to As the warp movesover the bar. there is a tendency for the latter to rotatebut this is counteracted by having the coils of the hand end of the ,bar as shown in Fig. 3, the coils of the right hanger extend around the bar in a right hand direction and the hangers extend around the bar in oppositedlrections. Thus, as viewed from the right coils of the left hand hanger extend around the bar in the opposite direction. As viewed in Fig. 1 the warp would tend to rotate the bar 31 in such a direction as to loosen the coilsrof the hanger shown at the right in Fig. 3 but the coils of the other hanger tend to tighten, thus preventing rotation of the bar. When picking out a mispick the warp is drawn back and the coils are acted on in the reverse manner, but in each case the coils of one of the hangers will be tightened to prevent rotation of the bar. In this way the bar is held against rotation and the coils remain where placed without creeping as would be the case if the bar rotated within the coils.

When a beam of different width is to be used the hangers can be moved along the bar until properly spaced to accommodate the new beam.

As shown in Fig. 3 the tension bar usually lies immediately over the lever 18 so that the latter will engage the coils to prevent side motion of the bar 31.

From the foregoing it will be seen that I have provided an extremely simple tension bar for left-offs which is held against rotation and can be adjusted to beams of varying widths by sliding the hangers along the bars. Also it will be seen that when the bar is being raise-d and is therefore relatively free to move sideways the lever 18 will serve to stop sidewise motion by engagement with the coils.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention, and I do not Wish to be limited to the details herein disclosed, but what I claim is 1. In a loom, a warp beam, a weighted lever, flexible friction devices for the beam, a tension bar operatively connected to the weighted lever, and connectors between the friction devices and the tension bar, each connector having a bar engaging portion bent to conform to the shape of the bar and held expanded from normally contracted position by engagement with the bar to grip the bar tightly.

2. In a loom, a let-elf mechanism, a warp beam, flexible friction devices contacting with the beam to restrain rotation thereof, a weighted lever, a tension bar operatively connected to the lever by the warp and engageable by the lever when the latter is raised, and connections between the tension bar and the flexible friction devices, said connection including a coiled spring the internal diameter of which is normally less than the diameter of the tension bar.

3. In a loom, let-ofi mechanism, a weighted lever, a warp beam, a pair of flexible friction devices for the beam, a tension bar operatively connected to the lever, and connections between the tension bar and the flexible friction devices, said connections including a pair of coiled spring devices each frictionally engaging the tension bar, said coiled portions of the devices being extended in opposite directions around the bar to prevent rotation of the latter.

4. A tension bar for loom let-offs employing flexible friction devices for the warp beams, said tension bar having attaching members for the friction devices, each member having a portion the normal inside dimensions of which are less than the dimensions of the part of the bar in engagement with the portion, said portion being held expanded beyond the normal size thereof by engagement of the bar to grip the latter tightly.

5. A tension bar for loom let-offs employing flexible friction devices for the Warp beams, said tension bar comprising a body portion of substantially cylindrical form and having attaching members for the friction devices movably held thereto, said means having coiled portions the internal diameter of which is less than the diameter of the tension bar to hold said means frictionally to the bar.

6. A tension bar for loom let-oil's employing flexible friction devices for the warp beams, said tension bar having mounted thereon a pair of attaching members each including a coiled portion frictionally engaging the bar, the coiled portions of said members extending around the bar in opposite directions to prevent rotation of the bar.

7. In a loom let-ofi' mechanism, a warp beam, flexible friction devices therefor, a weighted lever, a tension bar lying over the lever and means movably mounted on the bar and connected to the flexible devices, the attaching means being frictionally held to the tension bar and having coiled portions Surrounding the bar and extending below the bottom of said bar to engage the weighted lever when the latter is in raised position to prevent lateral motion of said tension bar.

In testimony whereof I have hereunto affixed my signature.

ELBRIDGE R. HOLMES. 

